The Persistent Patriots (The Saint TV Series)

Plot
Having saved the life of married politician Jack Liskard, the Saint is called upon again to help Liskard when the man is the victim of blackmail, over some letters he once wrote to a girl called Mary. Whilst Mary is happy to return the letters when approached by the Saint, it seems that they have gone missing and the Saint receives a phone call telling him that if he wants them he must rendezvous at an old church. It is a trap, from which the Saint escapes but when he goes back to Liskard's house his client has shot himself, leaving a suicide note. The Saint, however, believes he has been murdered.